TechTalk

Delfate stream - Built in support

using System;
using System.IO;
using System.IO.Compression;

public class Program
{

   public static void Main()
   {
       // Path to directory of files to compress and decompress.
       string dirpath = @"c:\users\public\reports";

       DirectoryInfo di = new DirectoryInfo(dirpath);

       // Compress the directory's files.
       foreach (FileInfo fi in di.GetFiles())
       {
           Compress(fi);
       }

       // Decompress all *.cmp files in the directory.
       foreach (FileInfo fi in di.GetFiles("*.cmp"))
       {
           Decompress(fi);
       }


   }

   public static void Compress(FileInfo fi)
   {
       // Get the stream of the source file.
       using (FileStream inFile = fi.OpenRead())
       {
           // Prevent compressing hidden and already compressed files.
           if ((File.GetAttributes(fi.FullName) & FileAttributes.Hidden)
               != FileAttributes.Hidden & fi.Extension != ".cmp")
           {
               // Create the compressed file.
               using (FileStream outFile =
                       File.Create(fi.FullName + ".cmp"))
               {
                   using (DeflateStream Compress =
                       new DeflateStream(outFile,
                       CompressionMode.Compress))
                   {
                       // Copy the source file into 
                       // the compression stream.
                       inFile.CopyTo(Compress);

                       Console.WriteLine("Compressed {0} from {1} to {2} bytes.",
                       fi.Name, fi.Length.ToString(), outFile.Length.ToString());
                   }
               }
           }
       }
   }

   public static void Decompress(FileInfo fi)
   {
       // Get the stream of the source file.
       using (FileStream inFile = fi.OpenRead())
       {
           // Get original file extension, 
           // for example "doc" from report.doc.cmp.
           string curFile = fi.FullName;
           string origName = curFile.Remove(curFile.Length
                   - fi.Extension.Length);

           //Create the decompressed file.
           using (FileStream outFile = File.Create(origName))
           {
               using (DeflateStream Decompress = new DeflateStream(inFile,
                   CompressionMode.Decompress))
               {
                       // Copy the decompression stream 
                       // into the output file.
                       Decompress.CopyTo(outFile);
                  
                   Console.WriteLine("Decompressed: {0}", fi.Name);
               }
           }
       }
   }
}